Thread: canon L series
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Old Jan 19, 2005, 2:32 PM   #3
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Join Date: Jul 2003
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Did not state which camera you are trying to use it on but on all the consumer/prosumer models drebel/10d/20d autofocus stops working at about f5.6.

The 1.4 tc, if it fits the lens,would make that F4 lens a 140-280mm F5.6.

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